Article: Reservoir characteristic and its relationship with estimated ultimate recovery of Jurrasic tight shelly limestone reservoir in the central Sichuan Basin, Southwest China Journal: International Journal of Oil, Gas and Coal Technology (IJOGCT) 2022 Vol.31 No.1 pp.1 - 17 Abstract: A combination of reservoir geological factors and a decline curve approach were applied in a play wide analysis, to reveal the relationship between the reservoir characteristics and estimated ultimate recovery (EUR) of the tight shelly limestone reservoir of Da'anzhai formation. As a result, all the oil bearing matrix pores and fractures in the reservoir correspond to the exponential decline, logarithmic decline and power law exponential decline with diminishing EURs of 86.1 MSTB, 39.3 MSTB and 5.9 MSTB (Mille Standard Tank Barrel) (P50) respectively. The proportions of megapores, macropores, mesopores, micropores, and nanopores in the reservoir were 1.6%, 3.7%, 18.1%, 27.8% 27.8%, and 48.8% respectively, and the corresponding EUR ranges tended to be above 294 MSTB, 110 MSTB to 294 MSTB, 37 MSTB to 110 MSTB, 4 MSTB to 37 MSTB, and below 4 MSTB. Thicknesses of fracture segments and thickness ratio's of dissolved cave segments to the reservoir were positively linearly related to the EUR. [Received: April 13, 2021; Accepted: November 26, 2021] Inderscience Publishers - linking academia, business and industry through research

Title: Reservoir characteristic and its relationship with estimated ultimate recovery of Jurrasic tight shelly limestone reservoir in the central Sichuan Basin, Southwest China

Authors: Shaoyong Wang; Yuan Wang; Denghua Li

Addresses: PetroChina Research Institute of Petroleum Exploration and Development, No. 20 Xueyuan Road, Haidian District, Beijing 100083, China ' PetroChina Research Institute of Petroleum Exploration and Development, No. 20 Xueyuan Road, Haidian District, Beijing 100083, China ' Strategic Research Centre of Oil and Gas Resources, MLR, No. 1 Fuxingmen Wai Street, Xicheng District, Beijing, 100034, China

Abstract: A combination of reservoir geological factors and a decline curve approach were applied in a play wide analysis, to reveal the relationship between the reservoir characteristics and estimated ultimate recovery (EUR) of the tight shelly limestone reservoir of Da'anzhai formation. As a result, all the oil bearing matrix pores and fractures in the reservoir correspond to the exponential decline, logarithmic decline and power law exponential decline with diminishing EURs of 86.1 MSTB, 39.3 MSTB and 5.9 MSTB (Mille Standard Tank Barrel) (P50) respectively. The proportions of megapores, macropores, mesopores, micropores, and nanopores in the reservoir were 1.6%, 3.7%, 18.1%, 27.8% 27.8%, and 48.8% respectively, and the corresponding EUR ranges tended to be above 294 MSTB, 110 MSTB to 294 MSTB, 37 MSTB to 110 MSTB, 4 MSTB to 37 MSTB, and below 4 MSTB. Thicknesses of fracture segments and thickness ratio's of dissolved cave segments to the reservoir were positively linearly related to the EUR. [Received: April 13, 2021; Accepted: November 26, 2021]

Keywords: reservoir space; EUR; tight shelly limestone; Da'anzhai formation; Sichuan Basin.

DOI: 10.1504/IJOGCT.2022.125054

International Journal of Oil, Gas and Coal Technology, 2022 Vol.31 No.1, pp.1 - 17

Received: 12 Apr 2021
Accepted: 26 Nov 2021
Published online: 24 Aug 2022 *

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Title: Reservoir characteristic and its relationship with estimated ultimate recovery of Jurrasic tight shelly limestone reservoir in the central Sichuan Basin, Southwest China

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